WALLS WITH LINES. WHAT IS THE ADDITIONAL LINE?

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FOR SOME REASON SIMILAR WALLS HAVE AN ADDITIONAL LINE.  WHY?  WHAT IS THE ADDITIONAL LINE?

[y-g-m-n]

that looks like foundation wall so it could be brick ledge of some sort.

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LOL ok, that narrows it down lol.  Nope, it's a foundation wall, no pony wall.

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how do I turn off brick ledge line?

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I understand that it's likely a brick ledge line but I don't want to see the line.  Other foundation walls have a brick ledge but they don't have the brick ledge line.  WTF!!!!!!!!!!!!!!!!!!!!

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This is crazy.  8 foundation walls are clean.  One foundation wall shows a brick ledge.  WTH.

Someone needs to be able to answer this problem.